Hi Ramon,<br><br>I remember reading that GrADS could handle HDF files which is why I was so surprised that I was having issues getting the data into GrADS; again I think this is a user-error and not a problem w/GrADS itself.<br>
<br>When I try to open the file in grads (v2.0.7a) using sdfopen it says that the file has no discernable x-coordinate. I tried constructing a ctl file for it as well but that too failed.<br><br>I can't find the exact link right now but I'm 99.9% sure that the file is in HDF format. I also attached the output of the GDAL (<a href="http://gdal.org/">http://gdal.org/</a>) utility gdalinfo, the top line of which says that the driver it is using is the "HDF4Image/HDF4 Dataset". I did a test plot of the data using gdal_translate to convert it into a png and the output matches what is on NASA's site which leads me to believe that GDAL is correct in interpreting this file as HDF(4).<br>
<br>My interpretation of all of this could be way off though as I am really just grasping for straws here.<br><br>Thanks,<br>Matt<br><br><div class="gmail_quote">On Fri, Apr 2, 2010 at 12:18 AM, Ramon Solano <span dir="ltr"><<a href="mailto:rsolanob@gmail.com">rsolanob@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div style="word-wrap: break-word;">Hello Matt,<div><br></div><div>GrADS has no problem working with HDF files, no matter if they are projected or not; what matters is if they are stored as a regular grid. You may have geolocation problems if the file is projected into something like a sinusoidal or some other not so common projection, but still you can have access to the actual data, do the processing and at the end to export the results to your favorite software (ENVI, Imagine, etc).</div>
<div><br></div><div>Of course, the first thing you need to have is the internal structure of the data file (data type, dimensions, data layers, interleaving, etc). I ran a HDF diagnostic utility on the file you mentioned and it appears that the file does not contain any grid, are you sure it is a HDF file? Looks more like a plain binary file, but that's just my guessing (HDF files are self described).</div>
<div><br></div><div>Regards,</div><div>Ramon<br><div>
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---</div><div style="word-wrap: break-word;"><br></div></span></span></div><div><div><div></div><div class="h5"><div>On Mar 31, 2010, at 6:41 AM, Matt Alonso wrote:</div><br></div></div><blockquote type="cite"><div><div>
</div>
<div class="h5">Hi All,<br><br>Sorry to bother folks w/this but I was wondering if anyone has had any success working w/SeaWIFS data (<a href="http://oceandata.sci.gsfc.nasa.gov/SeaWiFS/Mapped/8Day/NDVI/2010/" target="_blank">http://oceandata.sci.gsfc.nasa.gov/SeaWiFS/Mapped/8Day/NDVI/2010/</a>) in GrADS. I've been struggling w/creating the appropriate CTL for the HDF data. When I open the most recent 8day composite 4km file (<a href="http://oceandata.sci.gsfc.nasa.gov/cgi/getfile/S20100652010072.L3m_8D_LAND_NDVI_4km.bz2" target="_blank">http://oceandata.sci.gsfc.nasa.gov/cgi/getfile/S20100652010072.L3m_8D_LAND_NDVI_4km.bz2</a>) I'm having problems trying to read the file into GrADS. <br>
<br>Any info on this matter would be greatly appreciated. Thanks in advance.<br><br>Cheers,<br>Matt<br></div></div><div class="im">
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